A device which controls the voltage and current being delivered to a capacitor or battery.

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40 views

LiPo charging circuit

I'm using a 6s Lithium Polymer battery in one of my projects, and I'd like to make it more consumer friendly. This means that I should probably get rid of the need for a balance charger (which few ...
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1answer
24 views

Multiple Wireless charging coils (Qi) in parallel?

I am making a device that will be wireleslly charged and I decided to go for a standardized Qi transmitter/receiver. The device is a kind of bulk and I want it to have an option to get charged no ...
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3answers
55 views

Looking an IC chip to charge cell phone [duplicate]

I have a DC voltage source (between 5 and 10V) from which I want to charge cell phone with a USB cable. I believe that using a LM317 or similar IC for charging cell phones is not a good idea as most ...
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2answers
61 views

Diode oring and charger

I am trying to setup a schottky diode oring circuit to switch between my battery and a dc power supply. I am dealing with some pretty high amperages and a liPo battery, so I need to make sure I get ...
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2answers
39 views

Test car phone charger amperage [closed]

I have at car usb charger. It has 2 ports and is rated 2.1A when one port is used and 1A when both ports are used. I attached samsung tablet (N8000) witch requires 2A output. So, tablet isn't ...
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1answer
69 views

Charging a 3.7 V with a 5V usb charger [closed]

For a project, I want to charge a lipo battery (3.7V @2000mah) with a 5V USB charger. I'm not into electronics, so I don't know if is viable to do that. So, can I charger a 3.7 battery with a 5V ...
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0answers
6 views

One laptop charger for laptop and monitor? [migrated]

I have a monitor and a laptop and their chargers together are 91W. Both of them are 19V. So I was wondering whether I could just use a 90W charger and a cheap one male to two female 5.5x2.1mm splitter ...
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1answer
64 views

How does this battery charger circuit work?

I am having a hard time figuring out how this circuit works. This is a portion of a circuit which uses AC mains (220 V) to charge a 9 V rechargeable battery. I have added the schematic and the ...
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2answers
104 views

Calculate ampere using volt? [closed]

Can we calculate the output ampere of a battery charger by calculating battery voltage over time: 1. Get volt value name it volt1 2. Wait a second 3. Measure volt again name it volt2 So would the ...
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2answers
36 views

Is the efficiency of (Qi) wireless charging affected by a metal surface?

I recently picked up a Galaxy S7 Edge and love it. I've also gone "all in" on wireless charging, now owning three chargers: a third party standard charger, a third party QC 2.0 (15W) Adaptive Fast ...
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0answers
47 views

Transzorb for MCP73831 USB LiIon Charger?

The datasheet of MCP73831 (a small LiIon charger device) recommends a transzorb on the USB power input (VDD) for input over voltage protection. See Section 6.1.1.2. Absolute maximum ratings for VDD ...
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0answers
19 views

Zener diode in LT3652

I am designing a circuit for a battery charger using the LT3652 chip. The datasheet states that the BOOST pin - BOOST (Pin 11): Bootstrapped Supply Rail for Switch Drive. This pin facilitates ...
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1answer
27 views

Status pin of a charger IC

I am using the LT3652 charger chip,datasheet. Now, there is a status pin /CHRG. The pin is - CHRG (Pin 4): Open-Collector Charger Status Output; typically pulled up through a resistor to a reference ...
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2answers
58 views

What are the dimensions of US outlet holes? [closed]

I am specifically referring to the standard NEMA 5-15 three hole outlet that is used in North America. What are the dimensions of the holes in the outlets? Surprisingly, I am having difficulty in ...
0
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1answer
41 views

How can I build a charger for this RC helicopter? [closed]

I have this remote controlled helicopter: http://www.clasohlson.com/se/Radiostyrd-helikopter/31-8071 Currently it is charged by connecting the remote control. However, since the RC runs on batteries, ...
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1answer
130 views

TP4056 Lithium Charger Module issue

Im having an issue with TP4056 Lithium Charger Module. Connected the battery 3.7v 150mah battery. When charging the red led is on but it never shuts off and no charge state is reached even after 1-2h ...
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2answers
79 views

On an Apple 12W USB Charger, how are the D+ and D- lines configured?

Looking for the voltages on the V+ and V- lines of an Apple 12W charger that corresponds to the 2.4A output.
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1answer
60 views

Can an old SMPS serve as a tablet/cellphone charger [closed]

A computer SMPS is capable of providing stable power supply to multiple devices like hard drive, CD/DVD drive, etc.... Is it possible to convert an old SMPS to power a tablet/cellphone? What ...
1
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1answer
51 views

High-voltage cutoff for battery charger necessary?

I'm trying to build a treadle-powered general purpose USB charger. Internally, the treadle spins a motor which feeds through a diode bridge to charge up a storage battery. The battery then discharges ...
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3answers
163 views

Approval before using built portable charger on a smartphone

I've finally managed to set up a more efficient portable charger that uses 8 AA alkaline batteries(actually not so efficient). Schematic: simulate this circuit – Schematic created using ...
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0answers
47 views

Charge Li-Po battery with TP4056? (Or what else?)

I bought a single cell Li-Po battery and two different charger modules (one without protective circuit and one with protective circuit) from AliExpress. The Li-Po battery has a protection circuit ...
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2answers
72 views

What is the meaning of ripple voltage? and How to calculate a rectifier capacitor?

What is ripple voltage? I think it is the voltage difference of the two red arrows... Is that correct? My second question: If I need to use a voltage regulator LM7805CV. What would be the value ...
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3answers
2k views

Why some phones need a 5V charger although the battery needs 3.7V only?

I've many mobile (smart phone) chargers. The output of them is 5 volts but the battery needs 3.7v only. Why is it better to make a 5v charger then convert the 5v to 3.7v ? Why don't we just make a ...
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1answer
82 views

USB to male bullet connector

I'm looking for simplest possible solution to power a load via USB to male bullet connector. Requirements: +5V input voltage 15V output voltage 1,5A output current on the bullet connector very low ...
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1answer
35 views

Wind power charge controller

I have one of these motors that i want to use as a wind turbine generator. http://www.ebay.com/itm/181392138415?_trksid=p2057872.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT I want my setup to be ...
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2answers
124 views

Onboard charging system for hybrid electric tractor

I’m in the process of converting a Cub Cadet SLT1554 from gas to a hybrid-electric tractor using a Motenergy ME0909 PMDC Motor. See description/specifications below: Motenergy ME9090 PMDC Motor ...
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1answer
53 views

30-0-30 ACV 8A transformer to 12DCV [closed]

Good Day.. I have a 30ACV 8A transformer. I urgently want to make a 12DCV battery charger from it. What are the components that I should use? Please also help me out with its schematic. Your help ...
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2answers
80 views

Boost +12v from ATX PSU to ~13.5-14.5v [closed]

I understand that what I am doing requires the utmost care and that numerous precautions should be taken in completing a project like this. Out of necessity, I am going to fashion a car battery ...
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1answer
69 views

What if i charge a battery with low ampere.? [closed]

Assuming we have a mobile battery and a charger which has less ampere than the original one. Is it damage the battery? i am asking for just curiosity e.g charging a battery with a universal charger ...
2
votes
1answer
174 views

Questions about Li-ion battery charger and battery monitor chips

I want to build a system powered by 14.8v Li-po battery pack or mains power (selectable power path). When the mains adapter is connected, the battery will be charged and the system will be powered ...
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1answer
53 views

LiPo Charging Ciruit - Switching Help

I do understand that similar questions and maybe even the same question has been asked before, I've found them but unfortunately as a result of inexperience on my part I have been unable to adapt the ...
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3answers
124 views

Using Super Capacitors with solar cells and batteries to help save my dogs

I am looking to make a dog feeding mechanism that will operate regardless of power outages. The main point of this query initially is to figure out how to work with the materials I have (or can get) ...
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2answers
72 views

What does battery charger's current rating mean? [duplicate]

I am basically a software engineer but have some interest in electronics so this is probably a very basic question. I understand theoretically a battery or power source can provide as much current as ...
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2answers
73 views

Bike mobile charger

Hi, I've made a battery operated mobile charger using this circuit. I am able to charge the basic phones (with 2100mAh battery) with it. But the problem is, I couldn't charge any smart phones ...
0
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1answer
46 views

Charging battery

I have a NiCad battery that I got from an old rc car. I have some trouble charging it. the battery is rated 6v and the charger's voltage is rated 7.25 (why is it bigger)? however, I measured the ...
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2answers
89 views

Is this a viable mini wind turbine setup?

I'm going to build my first wind turbine. I have already constructed the prop, 5 blades 50cm long from PVC pipes. I've searched for a decent sized motor and charge controller. The turbine will be ...
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0answers
25 views

Charger for my own created battery pack

I am building an RC airplane, for which I have also created a battery pack. What kind of charger do I need to power up the simple line-up of: 6 x AAA, 1.2v, 800mah per battery. (Everything is lined up ...
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1answer
70 views

Lead Acid Battery Voltage rises very quickly

I am working on a charger for the first time. m charging a lead-acid battery (6V) by supplying a voltage of 7-7.2V & 100mA. But the voltage rises from 6.10 to 6.30 in just 5-10 seconds. What ...
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0answers
91 views

zener diode as rectifier in cheap mobile charger

Opened a very cheap mobile multi charger and find a zener (4.8V, 1/2W) diode is used as rectifier. Surprisingly it is giving ~ 4.9 V when no load and about 430mA to an old 3.8V torch bulb, almost ...
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2answers
49 views

difference in charging battery of different Ah

Can i use a lower Ah battery charger(say 20,30)to charge a higher Ah battery ie 110Ah?What are the consequences? What is the difference in the charger circuit in both case?
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1answer
75 views

Is a high current wall charger dangerous for my phone? [closed]

I've bought a USB wall charger to power my Raspberry Pi. I chose the 3A one so that I can connect some more power hungly devices like hard drives to the Pi's USB ports. I can connect 2 cables to the ...
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0answers
72 views

Designing a 3 mode smart solar battery charger with MPPT

I'm trying to design a solar charger with MPPT feature that runs in 3 modes (bulk, absorption and float) depending on the state of the battery. The logic is implemented in a fast micro controller and ...
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2answers
116 views

How do I calculate the energy (kWh) consumed by my 5V smartphone charger?

I'm having a little trouble in figuring out how much power is absorbed by my 5v smartphone charger. I'm curious as to how to account the energy loss due to stepdown.
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1answer
92 views

I want to design an adapter from USB to 4.3v and 70mA

How can I design an adapter between USB and 4.3v and 70mA. Can I just connect a USB cable to my device that takes 4.3v and 70mA? Is it likely to damage the device? I'm looking for a better than 50% ...
0
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1answer
95 views

How is the output voltage of a mobile phone charger fixed to a rated value? [duplicate]

Here is the circuit of cellphone charger. I have seen the input voltage range for a cellphone charger to be 100-230 V but the output voltage to be fixed to the rated value(like ~4.5 V). So, my ...
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2answers
72 views

Using a charger backwards [closed]

I was wondering if connecting a 5 volt source to a 5 volt charger is going to yield 220 volts at the plugging terminals(the charger is AC/DC,220 volts input and 5 volts output)As far as I know,every ...
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2answers
69 views

Li-po - li-ion chargers

I have bought a Li-po charger the other day and I looked up the IC and it stated Li-ion. Can you charge a Li-po with a Li-ion IC? And the other way around? The IC I am talking about is the TP4056. I ...
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4answers
90 views

Watts used by chargers eg laptop, wall warts etc

This is my first question on here, its quite easy and I am sure I have half the answer, maybe. I was thinking about how much power was being used by these wall chargers etc, you read the label it may ...
2
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1answer
85 views

ATtiny measuring voltage for battery charger

Would it be possible to use adc with the reference voltage at ground, to determine the voltage of say a battery? I was thinking of creating a battery charger with the attiny for automatic cutoff and ...
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1answer
139 views

How charge custom Li-ion pack 36v 10s6p

I have 10x 6p 18650 batteries. 13AH. I found a protection circuit. My issue is that I don't know how to charge the batteries. I could use a power source but I got it from my school and it isn't mine. ...